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G. STUCKY. DRYING APPARATUS.

N0. 565,522. Patented Aug. 11, 1896.

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G. STUCKY. DRYING APPARATUS.

No. 565,522. Patented Aug. 11, 1896.

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G, STUOKY.

DRYING APPARATUS. No. 565,522. Patented Aug. 11, 1896.

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G. STUCKY. DRYING APPARATUS,

No. 565,522. Patented Aug. 11, 1896.

UNITED I STATES GIOVANNI sTUoKY,

PATENT OFFICE. A

or VENICE, ITALY.

DRYING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 565,522, dated August 11, 1896.

Application filed February 13, 1895. Serial No. 538,253. (N0 de -l To all whom it may concern:

Be it known that I, GIOVANNI STUCKY, a citizen of the Republic of Switzerland, residing at Venice, in the Kingdom of Italy, have invented certain new and useful Devices for Drying Powderous, Mealy, and Grainy Substances, as Flour, Bran, Grains, &c., of which the following is a specification.

My invention has relation to driers and it consists in certain improvements which I will now describe in detail, reference being had to the accompanying drawings, in which- Figure 1 is a vertical section on or about on line 2 2 of Fig. 2, Fig. 2 being a section on or about on line 3 3 of Fig. 1, looking toward the left. Fig. 3 is a more or less schematic view of the driving mechanism. Fig. 4 is a fragmentary elevation illustrating the means for driving the drier and its fanshaft from the main suction-fan shaft; and Figs. 5 and 6 are fragmentary longitudinal and vertical sectional views, respectively, of the drier, drawn to an enlarged scale.

In the above-described drawings I have illustrated two driers in connection with a source of air supply as an example, and the arrangement shown will readily suggest to the skilled mechanic the connection with a source of air supply of a greater or less number of such driers. In said arrangement a suction and force fan casing or housing 0 is.

arranged below an elevated platform P, the fan p in said casing drawing air from a heater, for instance, (not shown,) through a'trunk T and forcing such air through suitable branch trunks n and m to the driers A.

As the construction of both driers is the same, a description of the construction of one will suffice.

The drier A consists of two stationary cylindrical heads b I), both connected at their lower end with the air-supply trunk m and provided with an axial bearing for a shaft 2', revoluble in bearings in suitable standards on the platform P and carrying a belt-pulley r. The heads I) are further provided with an outwardly-flaring circular flange b, that serves to close the ends of the outer cylinder c of the drier, presently referred to.

An open-ended cylinder 6, constructed of a foraminous material, as a wire fabric or perforated sheet metal, is provided near said open ends with supporting-arms g, radiating from an axial bearing for and rigidly secured to the aforesaid shaft 'L, which also carries 5 5 closed by the aforesaid outwardly-flaring flanges 79 on the drier-heads Z). The material to be dried is fed to said drying-chamber through a feed-trunk c at one end and discharged into a discharge-trunk d at the opposite end, said discharge-trunk being in communication with the drying chamber through a suitable opening in the encompassing flange b of one of the drier-heads b. The

outer cylinder c is or may also be constructed of a foraminous material, as a wire fabric or perforated sheet metal, the fineness of the mesh or perforations of both cylinders depending upon the fineness of the material to be dried.

If the outer cylinder 6 is constructed of a non-foraminous material, a suitable outlet for the air is provided, which can very conveniently be done by providing the flange b of the drier-head opposite to the inlet-port for the material with an air-outlet duct K,

as shown in Fig. 5.

In order that the material may be gradually and continuously translated from the feed to the discharge end of the drying-chamber, I provide the outer cylinder with spiral 9o blades f, preferably of great pitch, that fornr a screw-conveyer. At one end the outer cylinder c is secured to a ring, aportion of which is of increased thickness and of such configuration as to perform the function of a beltpulley t, and said outer cylinder is supported on rollers h, Fig. 6, at both ends.

The inner cylinder 6 revolves at a comparatively high speed, while the outer cylinder 6' revolves at a comparatively low speed, the

effect of the different speeds relatively to the operation of the screw-conveyers f on the outer cylinder being the same as if one of said v cylinders were stationary. To this end the An open-ended outer cylinder 6 of 60 small pulley r on shaft t of cylinder e is belted to a comparatively large pulley g on shaft 3 of fan 19, while the cylinder e, through its ringpulley t, is belted to a small pulley r on said shaft 8, as shown in Fig. ,3. The blades f on the inner periphery of the cylinder e are so arranged as to perform the function of a screw-conveyer and to slowly translate the material from the feed to the discharge end of the drying-chamber, and at the same time to take up and distribute said material over the inner cylinder 6 in the form of a thin sheet or scatter the same over said cylinder, according to the nature of said material, whereby the latter is thoroughly exposed to the air-currents and rapidly dried.

It will readily be seen that the improvements described lie, essentially, in the means for bringing the material into intimate con tact with the air, namely, in a scattered condition, the material being constantly kept alive within the dryingchamber, not only by the operation of the conveyer, but by the action of the air-currents, and is thereby, for the greater part of the time, practically held in suspension in a drying-atmosphere,thereby insuring its rapid and thorough desiccation, so that certain materials need not be passed through the driers more than once.

Of course other means than those described may be resorted to for imparting a difierential speed to the fans and drier-cylinders, while the construction of the latter and the arrangement of the means for supplying air thereto may also be modified without departing from the spirit of my invention.

Having thus described my invention, what I claim asnew therein, and desire to secure by Letters Patent, is-

1. A drier comprising two concentricallyarranged and independently-revoluble openended cylinders, the inner cylinder bein gperforated whereby a drying-chamber is formed between them, stationary heads for said cylinders, air-ports in said heads leading to the inner cylinder, forcing devices for forcing air into said inner cylinder, distributing devices within such cylinder for driving the air through its perforations into the dryingchamber, feed and discharge devices arranged to feed the material to the drying-chamber at one end and discharge it from the other end, and means for moving such material about the inner cylinder from said feed to said discharge end of the cylinder, substantially as and for the purpose set forth.

2. In a drier the combination with two concentric foraminous cylinders forming between them a drying-chamber, means for feeding the substance to be dried to said chamber at one end and discharging it at the opposite end, a distributer and conveyor movable with the outer cylinder for distributing the substance to be dried over the inner cylinder and conveying said substance from the feed to the discharge end of the drying-chamber, a suction-fan at each end of the inner cylinder, a distributing-fan intermediate of said suction-fans, and driving mechanism for driving the inner cylinder and fans at a greater speed than the outer cylinder, for the purpose set forth.

3. In a drier, the combination with two concentric foraminous cylinders arranged to form a drying-chamber between them, means for feeding a substance to the chamber at one end and discharging the same at the opposite end, screw-conveyer blades f secured to the inn er periphery of the outer cylinder operating to distribute or scatter the substance over the inner cylinder and convey such substance from the feed to the discharge end of the drying-chamber, a suction-fan 76 at each end of the inner cylinder, a distributing-fan Z inter mediate of said suction-fans, a suction and forcing fan,and suitable ducts connected with the case of the last-named fan and leading to the opposite ends of the inner cylinder, and driving mechanism for revolving the inner cylinder and fans at a greater speed than the outer cylinder, for the purpose set forth.

In testimony whereof I hereunto sign my name, in the presence of two subscribing witnesses, this 141th day of January, 1895.

GIOVANNI STUCKY. lVitnesses:

H. RABHART, E. BLOOM. 

